Ironhard
The Century Dictionary and Cyclopedia
noun.
The knapweed,
Centaurea nigra.
noun.
Vervain.
Word Usage
"He is a burly, black-bearded man of middle age, very blunt, prompt and rough, with small clear eyes, and plump nose and cheeks, which, however, like the rest of his flesh, are in ironhard condition."
suggests
ironbark